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bootfs.c revision 1.1 
      1 /*	$NetBSD: bootfs.c,v 1.1 2005/12/29 15:20:09 tsutsui Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2004 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by UCHIYAMA Yasushi.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 #include <lib/libsa/stand.h>
     40 #include <lib/libkern/libkern.h>
     41 
     42 #include <machine/param.h>
     43 #include <machine/bfs.h>
     44 #include <machine/sector.h>
     45 
     46 #include "local.h"
     47 
     48 /* System V bfs */
     49 
     50 FS_DEF(bfs);
     51 
     52 struct fs_ops bfs_ops = {
     53 	bfs_open, bfs_close, bfs_read, bfs_write, bfs_seek, bfs_stat
     54 };
     55 
     56 struct bfs_file {
     57 	struct bfs *bfs;
     58 	int start, end;
     59 	size_t size;
     60 	int cur;
     61 	uint8_t buf[DEV_BSIZE];
     62 };
     63 
     64 int
     65 bfs_open(const char *name, struct open_file *f)
     66 {
     67 	struct bfs_file *file;
     68 
     69 	if ((file = alloc(sizeof *file)) == 0)
     70 		return -1;
     71 	memset(file, 0, sizeof *file);
     72 
     73 	if (bfs_init(&file->bfs) != 0) {
     74 		free(file, sizeof *file);
     75 		return -2;
     76 	}
     77 
     78 	if (!bfs_file_lookup(file->bfs, name, &file->start, &file->end,
     79 	    &file->size)) {
     80 		bfs_fini(file->bfs);
     81 		free(file, sizeof *file);
     82 		return -3;
     83 	}
     84 
     85 	printf("%s: %s %d %d %d\n", __FUNCTION__, name, file->start,
     86 	    file->end, file->size);
     87 
     88 	f->f_fsdata = file;
     89 
     90 	return 0;
     91 }
     92 
     93 int
     94 bfs_close(struct open_file *f)
     95 {
     96 	struct bfs_file *file = f->f_fsdata;
     97 
     98 	bfs_fini(file->bfs);
     99 
    100 	return 0;
    101 }
    102 
    103 int
    104 bfs_read(struct open_file *f, void *buf, size_t size, size_t *resid)
    105 {
    106 	struct bfs_file *file = f->f_fsdata;
    107 	int n, start, end;
    108 	uint8_t *p = buf;
    109 	size_t bufsz = size;
    110 	int cur = file->cur;
    111 
    112 	if (cur + size > file->size)
    113 		size = file->size - cur;
    114 
    115 	start = file->start + (cur >> DEV_BSHIFT);
    116 	end = file->start + ((cur + size) >> DEV_BSHIFT);
    117 
    118 	/* first sector */
    119 	if (!sector_read(0, file->buf, start))
    120 		return -2;
    121 	n = TRUNC_SECTOR(cur) + DEV_BSIZE - cur;
    122 	if (n >= size) {
    123 		memcpy(p, file->buf + DEV_BSIZE - n, size);
    124 		goto done;
    125 	}
    126 	memcpy(p, file->buf + DEV_BSIZE - n, n);
    127 	p += n;
    128 
    129 	if ((end - start - 1) > 0) {
    130 		if (!sector_read_n(0, p, start + 1, end - start - 1))
    131 			return -2;
    132 		p += (end - start - 1) * DEV_BSIZE;
    133 	}
    134 
    135 	/* last sector */
    136 	if (!sector_read(0, file->buf, end))
    137 		return -2;
    138 	n = cur + size - TRUNC_SECTOR(cur + size);
    139 	memcpy(p, file->buf, n);
    140 
    141  done:
    142 	file->cur += size;
    143 
    144 	if (resid)
    145 		*resid = bufsz - size;
    146 
    147 	return 0;
    148 }
    149 
    150 int
    151 bfs_write(struct open_file *f, void *start, size_t size, size_t *resid)
    152 {
    153 
    154 	return -1;
    155 }
    156 
    157 off_t
    158 bfs_seek(struct open_file *f, off_t offset, int where)
    159 {
    160 	struct bfs_file *file = f->f_fsdata;
    161 	int cur;
    162 
    163 	switch (where) {
    164 	case SEEK_SET:
    165 		cur = offset;
    166 		break;
    167 	case SEEK_CUR:
    168 		cur = file->cur + offset;
    169 		break;
    170 	case SEEK_END:
    171 		cur = file->size + offset;
    172 		break;
    173 	default:
    174 		return EINVAL;
    175 	}
    176 
    177 	if (cur  < 0 || cur >= file->size) {
    178 		return EINVAL;
    179 	}
    180 
    181 	file->cur = cur;
    182 
    183 	return (off_t)cur;
    184 }
    185 
    186 int
    187 bfs_stat(struct open_file *f, struct stat *stat)
    188 {
    189 	struct bfs_file *file = f->f_fsdata;
    190 
    191 	stat->st_size = file->size;
    192 
    193 	return 0;
    194 }
    195